如何捕获node.js / express服务器错误，如EADDRINUSE？ [英] How do I catch node.js/express server errors like EADDRINUSE?

问题描述

这是我的代码（它是coffeescript并使用颜色，但这是不相关的）

This is my code (It's coffeescript and uses colors but that's not relevant)

# If this module is executed
if !module.parent
    # Start server
    try
        hons_server.listen config.port
        console.log 'Listening to port ' + config.port
    catch err
        console.error "Couldn't start server: #{String(err)}".red

hons_server 是一个 express.js服务器<一>。我很难理解为什么错误由于$ code> hons_server.listen（）而不会被try / catch捕获。当我运行我的服务器两次时，我得到输出：

hons_server is an express.js server. I'm having a hard time understanding why errors thrown as a result of hons_server.listen() aren't caught by the try/catch. When I run my server twice I get the output:

$ coffee src/server.coffee
Listening to port 9090

node.js:201
        throw e; // process.nextTick error, or 'error' event on first tick
              ^
Error: listen EADDRINUSE
    at errnoException (net.js:632:11)
    at Array.0 (net.js:733:26)
    at EventEmitter._tickCallback (node.js:192:40)

I 'd想知道为什么抛出的错误没有被捕获，以及如何/在哪里可以捕获EADDRINUSE错误。

I'd like to know why the thrown error isn't caught, and how/where I can catch the EADDRINUSE error.

推荐答案

收听服务器上的错误事件isntance

Listen for the error event on the server isntance

hons_server.on 'error', (err) ->
    console.log 'there was an error:', err.message

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